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    <title>Document</title>
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<body>
    <script>
        // 编写一个函数 ，输入一个数字，返还数字的长度
        function nu(a) {
            for (i = 0; i < a.length; i++) {

            }
            console.log(i);
        }
        nu("980788324");
        nu("123456");
    </script>
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